Welcome to the forum and sorry to hear, that you have this problem.
But hopefully this issue will be solved soon.
Have you read the posting by rae I have already linked to above?
Just one little correction regarding maths:
The Fairphone 3 is not even sold for three years, let alone the 3+.
September 2019 to February 2021 is not even one and a half years; so not even half the 3 years you mention. Doesn’t really make it easier or more acceptable, if one has to wait for months.
But - in my personal view - it shows, how complicated it can be to find a bug in an environement as complex as a smartphone and different mobile networks. Plus, it seems, that there might be different reasons, since not everyone reported the troubles connected to ad-infested games. (I am, lucky enough not to have suffered from this bug.)